Which three major factors contributed to the roman empire's decline? political insurrections, military rebellions, famine political instability, military conflict, economic crisis political dictatorship, military genocide, severe drought political stability, military peace, economic growth

a. competition with other nations.

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

it required the unanimous approval of the states before the congress could enact any measure.